He was a football player since college. He later made it to the NFL, and was the proud owner of two Super Bowl rings. After the rush of the game, however, he would often come home with constant headaches and suffered multiple concussions. After his NFL career, he began to suffer from dementia, depression, memory problems and searing pains on the left side of his head. After sending a text message and leaving a note asking that his brain be studied, David Duerson committed suicide on Feb. 17.